公开(公告)号：US20200327905A1

公开(公告)日：2020-10-15

申请号：US16835770

申请日：2020-03-31

Applicant: SHOWA DENKO K.K.

Inventor： Takayuki FUKUSHIMA ,  Chen XU ,  Lei ZHANG ,  Hisato SHIBATA ,  Takehiro YAMAGUCHI ,  Kazuya NIWA ,  Tomoo SHIGE ,  Hiroaki NEMOTO ,  Yuji UMEMOTO ,  Hiroshi KOYANAGI

IPC: G11B5/65 ,  G11B5/66 ,  G11B5/60

Abstract: A magnetic recording medium includes a substrate, an underlayer, and a magnetic layer that are arranged in this order. The magnetic layer has a granular structure including magnetic grains having a L10 crystal structure, and grain boundary parts having a volume fraction in a range of 25 volume % to 50 volume %. The magnetic grains have a c-axis orientation with respect to the substrate. The grain boundary parts include a material having a lattice constant in a range of 0.30 nm to 0.36 nm, or in a range of 0.60 nm to 0.72 nm.